KR900003294B1 - Process for the production of yarn reinforced synthetic resin hose - Google Patents

Abstract

A process for producing a synthetic resin hose reinforced with a steel wire layer comprises (a) welding together by coating the layer on the outside surface of the inner duct extruded from the extruding outlet of the hollow cylinder, (b) passing then through the moving outer extruding duct, and (c) incorporating the inner duct, the steel wire layer with the outer duct by extruding the melted synthetic resin compsn. from the dice of the outer duct.

Description

Manufacturing method of synthetic resin hose reinforced with screen layer

1 is a front view illustrating the main part of the manufacturing process according to the first embodiment of the present invention,

2 is an enlarged front view illustrating the state in which the screening layer is coated on the outer surface of the inner tube extruded during the first step.

3 (a) is a partial longitudinal cross-sectional view of the hose produced by the method of the present invention,

3 (b) is a partial longitudinal cross-sectional view of a hose manufactured by a conventional method.

* Explanation of symbols for the main parts of the drawings

1: Inclined creel 1 ': Inclined

2: left weft sacryl 2 ': left weft sac

3: dominant weft krill 3 ': dominant weft

4: gear type eye guide 4 ': tool

5: hollow cylinder 5 ': extrusion hole of the hollow cylinder (5)

6: interior 7: screening layer

8: Retractable External Extruded Tube 9: External Extrusion Die

9 ': woo pulley 10: appearance

The present invention relates to an improvement of a method for preparing a synthetic resin hose reinforced with a mesh screen layer.

Conventionally, a method of manufacturing a synthetic resin hose reinforced with a screening layer by coating a mesh screening layer on the outer surface of the inner tube and coating the outer surface thereon in a molten state is known, but in this case, once the inner tube is completed, The outer surface of the inner tube is coated with a reticulated layer, and the outer member is injected or extruded on it, so the contact surface between the layer and the outer surface of the inner tube is in a fluid state, so that the layer can serve as a reinforcement for the outer wall. The reinforcement role for the steel is almost insignificant, and since the screening layer is not fixed to the inner circumferential surface of the inner tube, the spacing between the interconnections is distorted due to the extrusion force in forming the exterior, so that the uniform spacing cannot be maintained. The judging layer does not have a uniform organization and as a result the seam There is a problem that can not exhibit a uniform reinforcement role by the four layers, and also in the case of the reinforcing core embedding device of the high pressure hose made of synthetic resin of the Republic of Korea Patent Publication No. 84-3065 At the same time, since the injection layer is integrally formed, it is difficult to control the screening layer to be uniformly positioned at a constant position between the inner tube and the exterior, so that the screening layer cannot exhibit a uniform reinforcing effect on the inner and outer walls of the hose. In addition, since the mesh screen is not fixed to the inner tube or the exterior wall in advance, it is possible to maintain a constant interval by distorting the space between the yarns of the mesh screen due to the extrusion force applied during the coextrusion of the inner tube and the exterior. The finished hose has a uniform reinforcing effect due to the nonuniformity of the structure of the reticulated screening layer. There was a problem that could not be indicated. (See also "b" in FIG. 3)

Therefore, the present invention solves the problems of the related art, and the examination layer is integrally and strongly bonded to the inner tube and the outer body in a uniform state at a constant position between the inner and outer tubes, so that the examiner layer can be applied to the inner tube and the outer tube at the same time. At the same time, the screening layer is fixed and uniformly formed in advance so as to be in close contact with the inner tube in the molten state, thereby preventing the structure of the screening layer from being disturbed even when extruded during external extrusion. Has provided a method that can exhibit a uniform reinforcing effect due to the presence of the examination layer having a uniform structure (see FIG. 3 "a"), as described in detail with the embodiment according to the accompanying drawings as follows.

Example 1

In FIG. 1, the inclined 1 'is released to the inclined creel 1, in which a plurality of inclined bobbins are circumferentially circulated, and then each gear 4' of the geared eye guide 4 passes through the geared eye guide ( It was sent forward along the upper surface of the hollow cylinder (5) connected to 4).

On the other hand, the left weft sacryl (2) turned left by the left hand pulley (P) and the left weft sac (2 ') and the right weft sacryl (3) connected to the right hand pulley (P) which turns right in the opposite direction to the left hand pulley (P) From the right hand weft 3 'at the same time cross the X-shaped in the left and right directions on the inclination 1' passing through the surface of the hollow cylinder 5, respectively, these three (1'-2) '-3') constitutes the delusion screening layer 7.

On the other hand, the inner tube 6 melt-extruded from the extruded port 5 'of the hollow cylinder 5 is extruded, and the first end of the screening layer 7 is pulled out of the inner tube 6 to be melt-extruded. When the coating is applied upward, the shrinkage force of the screening layer acts so that the screening layer is coated with the second degree while exhibiting the shrinking force on the outer surface of the inner tube 6 melt-extruded.

Therefore, the viscosity of the inner tube surface and the output power of the screening layer interact with each other, and the inner tube surface layer and the screening layer 7 are strongly bonded and integrated as in the second degree.

Subsequently, the joint between the integrated inner tube and the screening layer was sent into the forward-receiving extruded tubular body 8, but not shown, where the synthetic resin melt for external appearance was extruded or injected to integrally form the outer layer. .

In this way, the screening layer could be integrated in the state of being strongly adhered to the inner tube at the same time as the appearance, and thus the integrated hose was not shown, but was sent to a known cooling device to fix and harden the resin to produce a desired synthetic resin hose.

Synthetic resin hoses manufactured in this way were not only able to play the role of sufficient and effective reinforcement for the inner tube as well as the outer layer at the time of frequent flexion, but also placed at a uniform position between the outer tube and the inner tube. The uniformity of tensile strength and flexural strength of was obtained.

(In the conventional case, there was no adhesive between the screening layer and the inner tube surface, so the role of the inner tube reinforcing due to the screening layer was hardly expected, or the reinforcement core of the synthetic resin high pressure hose of Korean Patent Publication No. 84-3065) In the case of a plum device, since the inner tube, the examination layer, and the exterior are integrally formed at the same time, the examination layer is difficult to adjust so as to be uniformly positioned at a constant position between the inner tube and the exterior. There was a problem that can not exhibit a uniform reinforcing effect)

Example 2

In Example 1, the hollow cylinder 5 and the retractable external extrusion molding tube 8 were separated from each other, but in the present Example 2, the retractable external extrusion molding tube 8 was hollowed out. Advance toward the cylinder 5 so that the initial junction of the inner tube 6 and the screening layer 7 is just below the exit opening (or extrusion port) (not shown) of the tube body 8 at this point. ) And the screening layer (7) and the external appearance were integrally bonded at the same time.

In this case, as compared with the case of Example 1, there was an effect of further improving workability and productivity. In addition, in the state of Example 2, when the forward-type appearance-extrusion molding tube 8 is retracted and the work is performed, it is similar to Example 1.

It is installed on the concentric shaft of the left and right wesacry (2) and the right and the right wesacry (3), the rotating shaft may be inserted into the hollow inner tube (not shown) may supply compressed air instead of the rotating shaft, but this method Since it is known, the description and structure of the advantages are omitted.

In addition, the hollow cylinder 5 may be advanced, but it is more convenient to configure the exterior extrusion molded tube 8 to be advanced, and both may be combined from the beginning. Some difficulty is involved in the process of drawing the end of the head) onto the inner tube (6).

However, in the embodiment of the present invention, any one of the above three may be selected and implemented.

The characteristics of the manufacturing method of the present invention configured as described above are as follows.

Examination layer formed of left weft yarn (2 ') and right weft yarn (3') wound in X-shape on slope (1 ') on the surface of hollow cylinder (5) in synthetic resin hose with reinforced screen between inner tube and exterior (') (芯 系 層) to be drawn on the inner tube (6) that is melt-extruded from the extrusion port (5') of the hollow cylinder (5), characterized in that the three-integrated with the appearance coated thereon By cooling and fixing in accordance with a known method, the desired synthetic resin hose of the present invention is produced.

When comparing the difference in operation and effect between the method of the present invention and the method of the conventional invention is as follows.

Conventionally, a method of manufacturing a synthetic resin hose reinforced with a screening layer by coating a mesh screening layer on an outer surface of an inner tube and coating the exterior in a molten state is known in this case. Since the outer screen is coated with a mesh screening layer and then the injection or extrusion coating of the exterior member is placed on the outer surface, the contact surface between the screening layer and the inner surface of the inner tube is in a fluid state, so the screening layer can act as a reinforcement for the exterior wall material. As the reinforcement role has almost insignificant results, and the screening layer is not fixed to the inner circumference of the inner tube, the gap between the real and inter-floods is disturbed by the extrusion force during the appearance, so that the uniform gap cannot be maintained. The layers do not have a uniform structure and as a result, throughout the hose In the case of reinforcing core embedding device of high pressure hose made of synthetic resin of Korean Patent Publication No. 84-3065, the inner tube, the reticulated layer and the exterior are all integrated at the same time. It is difficult to control the screening layer to be uniformly positioned at a constant position between the inner tube and the exterior because it is injection-molded, and thus a problem has been found that the screening layer cannot exhibit a uniform reinforcing effect on the inner and outer wall surfaces of the hose. In addition, since the mesh screen is not fixed to the inner tube or the exterior wall in advance, the extrusion between the inner tube and the exterior is exerted on the coextrusion process, and thus the gap between the yarns of the mesh screen is disturbed, so that a constant gap cannot be maintained. The finished hose has a uniform reinforcing effect due to the unevenness of the structure of the reticulated screen There was a problem that could not be indicated. (See also "b" in FIG. 3)

Thus, the present invention solves the problems of the prior art and allows the examination layer to be integrally and strongly bonded integrally to both the interior and exterior in a uniform state at a constant position between the interior and exterior, so that the examination layer is both external and at the same time. At the same time, the screening layer is fixed and uniformly formed in advance so as to be in close contact with the inner tube in the molten state, thereby preventing the structure of the screening layer from being disturbed even when the extrusion force is applied during the external extrusion. The hose provides a way to achieve a uniform reinforcing effect due to the presence of a screening layer with a uniform structure (see also "a" in Figure 3).

(In the cross-sectional illustration of the conventional hose of FIG. 3B, the screening layer may be located at the intermediate position between the inner tube and the outer tube, may be located in the outer tube, or may be located in the inner tube. It can be confirmed that the arrangement is non-uniform, and there is also a wide part of the interval between the examination, there is also a narrow part can confirm that the interval between the examination is non-uniform, but compared with the present invention of FIG. In the cross-sectional view of the hose, the screening layer is not only located exactly in the middle of the inner tube and the exterior, but the intervals between the screening are the same, so the structure of the screening layer in this case shows a uniform state.)

Claims (1)

In the method for producing a synthetic resin hose reinforced with a screening layer between an inner tube and an outer surface, the screening layer 7 is drawn out to the outer circumference of the inner tube 6 in the molten state extruded from the extrusion port 5 'of the hollow cylinder 5. The coating is brought into close contact with each other, and then it is sent into the retractable exterior extrusion molded tube 8 where the melted synthetic resin composition is extruded from the exterior die 9 so that the inner tube, the screening layer and the exterior are fused together integrally. A method of producing a synthetic resin hose, characterized in that the reinforcement with a screening layer for cooling and curing according to a known method.

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